JP6653837B2 - Diaphragm pump valve structure - Google Patents

Description

  The present invention relates to a valve structure for a diaphragm pump.

  Various types of diaphragm pumps are known, and a pair of diaphragm pumps are opened and closed to open a suction port and close a discharge port during a suction operation of a diaphragm, and to close a suction port and open a discharge port during a discharge operation of a diaphragm. (See Patent Document 1).

  As shown in FIG. 1, the structure of a valve used in such a diaphragm pump includes a valve molded body J1 called a check valve and a valve receiving member J2 called a valve seat. This valve structure is a structure in which a valve molded body J1 formed of elastic rubber or the like is superimposed on a valve receiving member J2 as shown in the drawing, and the two are pressed against each other at a peripheral edge portion J21 to be in close contact with each other. Here, a flow hole J20 through which a fluid passes penetrates through the center of the valve receiving member J2, and a protrusion J20a is provided on the periphery of the flow hole J20. On the other hand, the valve molded body J1 is provided with a closed portion J10 that closes the flow hole J20 at the center, and the closed portion J10 and the outer peripheral contact portion J11 that is in close contact with the peripheral edge J21 of the valve receiving member J2. An opening J12 through which the fluid passes is formed.

JP 2001-12356 A

  Such a valve structure is operated by a pressure difference between the space A and the space B partitioned by the valve. When the pressure of the space A becomes higher than the pressure of the space B by the operation of the diaphragm, the flow hole J20 is opened. When the pressure in the space A becomes lower than the pressure in the space B in the closed state, the closing portion J10 of the valve molded body J1 separates from the raised portion J20a of the valve receiving member J2, and the flow hole J20 and the opening J12 are closed. The communicating flow path is opened, and fluid movement from the B space to the A space becomes possible.

  In a diaphragm pump having such a valve structure, the thickness of the valve molded body J1 is made thinner in order to increase the responsiveness of the valve. At this time, if the state in which the pressure in the space B is lower than the pressure in the space A is continued due to the use state of the diaphragm pump, the closing portion J10 of the valve molded body J1 is drawn into the flow hole J20 of the valve receiving member J2. This causes a deformation such that a wrinkle is formed in the closed portion J10, and the sealing function of the closed portion J10 is deteriorated.

  Such a problem is likely to occur when the diaphragm pump is used as a deaeration pump, and when the deaeration pump negatively pressurizes the inside of the container, it takes time to continuously obtain a somewhat high negative pressure state. There is a problem that a desired suction pressure cannot be obtained.

  An object of the present invention is to address such a problem. That is, it is an object of the present invention to avoid a decrease in the sealing function of the valve caused by the use state of the diaphragm pump.

In order to achieve such an object, a valve structure of a diaphragm pump according to the present invention has the following configuration.
A valve structure of a diaphragm pump comprising a pair of valves that open a suction port and close a discharge port during a suction operation of a diaphragm and close a suction port and open a discharge port during a discharge operation of the diaphragm, wherein the pair of valves At least the valve on the suction port side includes a valve receiving member having a flow hole and a valve molded body having a closing portion closing the flow hole, and the suction of the closing portion is suppressed inside the flow hole. The valve structure of the diaphragm pump, wherein a stop portion is provided.

  According to the valve structure of the diaphragm pump having such features, it is possible to avoid a phenomenon in which the closed portion of the valve molded body is sucked into the flow hole of the valve receiving member, so that the sealing of the valve caused by the usage of the diaphragm pump is prevented. Deterioration of function can be avoided.

It is an explanatory view showing a valve structure used for a conventional diaphragm pump. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing (the perspective view which showed the valve molding and the valve receiving member) which showed the valve structure of the diaphragm pump which concerns on embodiment of this invention. It is explanatory drawing which showed the valve structure of the diaphragm pump which concerns on embodiment of this invention ((a) is a top view of a valve receiving member, (b) is XX sectional drawing of (a)). BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view (sectional structure view) showing a main part (pump head) of a diaphragm pump adopting a valve structure according to an embodiment of the present invention. It is explanatory drawing which showed the valve structure of the diaphragm pump which concerns on another embodiment of this invention ((a) is a top view of a valve receiving member, (b) is X'-X 'sectional drawing of (a), ( c) is an enlarged view of the K portion of (b)).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 2 and 3 show a valve structure of the diaphragm pump according to the embodiment of the present invention (FIG. 2 is a perspective view showing a valve molded body and a valve receiving member, and FIG. FIG. 3B is a plan view of the member, and FIG. 3B is a sectional view taken along line XX of FIG.

  The valve 1 includes a valve molded body 10 formed of a thin elastic rubber material or the like and a valve receiving member (valve seat) 20 formed of resin molding or the like, similarly to the related art. The valve molded body 10 includes a closed portion 11 at a central portion, an opening 12 provided around the closed portion, and an outer peripheral contact portion 13. The valve receiving member 20 is provided with a flow hole 21 at a central portion, and a stop portion 22 for suppressing suction of the closing portion 11 of the valve molded body 10 inside the flow hole portion 21. A raised portion 23 is provided on the periphery of the flow hole portion 21, and a flat portion is formed on the peripheral portion 24 of the valve receiving member 20 so that the outer peripheral contact portion 13 of the valve molded body 10 is pressed in a state of being in close contact therewith. I have.

  Such a valve 1 is used in a state where the outer peripheral contact portion 13 of the valve molded body 10 is pressed against and adhered to the peripheral portion 24 of the valve receiving member 20, and the closed portion 11 of the valve molded body 10 is The flow hole 21 of the valve receiving member 20 is closed by being in close contact with the raised portion 23, and the closed portion 11 is separated from the raised portion 23, whereby the fluid flow path communicating the flow hole 21 and the opening 12 is formed. It is formed.

  The stop portion 22 provided inside the flow hole portion 21 of the valve receiving member 20 is provided in a wall shape that partitions the opening of the flow hole portion 21 into a plurality of portions, and is 0.2 to 0 from the sealing surface (top) of the raised portion 23. It is provided to have a step of .4 mm. The flow hole 21 has an opening area of 50% or more as compared with the case where the stopper 22 is not provided.

  The material forming the valve receiving member 20 including the stop portion 22 includes, in addition to fluorine rubber, which is excellent in heat resistance and chemical resistance and has been widely used in valve structures, polytetrafluoroethylene (low in friction resistance) PTFE) resin and polyphenylene sulfide (PPS) resin are suitable.

  By providing such a stopper 22, even if the closing part 11 is brought into a pressure state in which the closing part 11 is sucked into the through hole 21, the closing part 11 is received by the stopping part 22 and enters the through hole 21 deeply. It does not become. Further, it is possible to suppress the generation of wear powder generated by the friction of the seal surface, and to prevent the pressure difference from occurring on the seal surface due to the wear powder. Thereby, it is possible to avoid a decrease in the sealing function due to the deformation of the valve molded body 10.

  FIG. 4 shows a main part (pump head) of a diaphragm pump adopting such a valve structure. The pump head 100 closes the chamber space of the chamber 103 provided below the valve case 101 having the head 200 at the top with a disk-shaped diaphragm 102 made of an elastic sheet material such as synthetic rubber. Is formed at the center of the diaphragm 102, which is fixed to the tip of a crankshaft (not shown) that reciprocates up and down, and can be elastically deformed to move with amplitude. The outer circumference of the circle is held by the valve case 101 at the circumference of the outermost diameter of the chamber 103.

  The valve structure following the suction hole 103a and the discharge hole 103b penetrating the upper two places of the chamber 103 has a valve molded body 10 made of elastic rubber and a valve receiving member 20 via an O-ring 106. 1A and 1B, the O-ring 106 is laminated and inserted into the cylindrical hole portion in the valve case 101 so that the O-ring 106 is located on the downstream side in the flow direction of the suction-side and discharge-side valves 1A and 1B. The structure is such that the member 104 is pressurized and fixed.

  In the pushing member 104, a suction path 105a connecting the suction port 130a of the suction side nozzle 130 and the suction hole 103a and a discharge path 105b connecting the discharge port 140a of the discharge side nozzle 140 and the discharge hole 103b are partially provided. Have been.

  Such a pump head 100 uses a crankshaft to vertically displace a central plane portion of a diaphragm 102 to increase or decrease the volume of an intermediate storage 107, and utilizes a pressure fluctuation in a chamber 103 generated at that time to generate a fluid. Is sent in one direction from the suction port 130a to the discharge port 140a by repeating a series of operations.

  Here, a pair of valves 1A and 1B in which a valve molded body 10 functioning as a check valve and a valve receiving member 20 are overlapped, is arranged such that the valve 1A on the suction side (left side in the drawing) has the valve molded body 10 on the diaphragm 102 side. The valve 1B on the discharge side (right side in the figure) has the valve receiving member 20 disposed on the diaphragm 102 side.

  When the diaphragm 102 is displaced downward (during a suction operation), the valve molded body 10 of the valve 1A on the suction side is pushed by the fluid sent from the suction port 130a via the suction passage 105a, and the valve receiver When the pressure extruded from the flow hole 21 of the member 20 exceeds the limit of the elastic deformation strength of the valve molded body 10, it is elastically deformed in an arc shape.

  Then, a gap is formed between the opposed surfaces of the valve molded body 10 and the valve receiving member 20, and the flow hole 21 of the valve receiving member 20 and the opening 12 of the valve molded body 10 are connected via the gap, so that the fluid is sucked. The liquid flows from the inlet 130a through the suction passage 105a, the communication hole 21 and the opening 12 to the intermediate storage 107 in the chamber 103 through the suction hole 103a, and the inside of the chamber 103 closed by the diaphragm 102 is filled with fluid. At this time, in the valve 1B on the discharge side, the valve molded body 10 comes into close contact with the valve receiving member 20 due to the negative pressure of the chamber 103 and closes the flow hole 21 of the valve receiving member 20.

  Next, when the diaphragm 102 is in a stationary state in which it is not displaced, or when the diaphragm 102 is displaced upward (during a discharge operation), the valve body 10 of the valve 1A on the suction side returns to its original elastic deformation, and the valve receiving member 20 facing the valve receiving member 20 is closed. Since the flow hole 21 is completely closed, the fluid in the intermediate storage 107 does not flow back to the suction passage 105a.

  Then, since the inside of the chamber 103 becomes positive pressure due to the displacement above the diaphragm 102, the valve molded body 10 on the discharge side is pushed by the fluid sent from the discharge hole 103b by this pressure and moves toward the discharge path 105b side. Since the flow hole 21 of the valve receiving member 20 and the opening 12 of the valve molded body 10 communicate with each other, the fluid of the intermediate storage 107 in the chamber 103 flows through the flow passage 21 in the valve 1B on the discharge side. The liquid is discharged from the discharge port 140a from the opening 12 through the discharge path 105b.

  When the suction port 130a of such a diaphragm pump is connected to an airtight container and used as a deaeration pump, when the pressure in the container is gradually reduced, the suction-side valve molded body 10 flows through the valve receiving member 20. Although a pulling force acts in the hole 21, the deformation of the valve molded body 10 pulled to the low-pressure side can be achieved by providing the stopper 22 inside the flow hole 21 of the valve receiving member 20 on the suction side. Can be suppressed, and the sealing surfaces of the valve molded body 10 and the valve receiving member 20 can be maintained at a constant pressure. This can prevent a phenomenon in which the suction pressure decreases over time when used as a degassing pump.

  Next, another embodiment will be described with reference to FIG. 5A is a plan view of the valve receiving member 20 ′, FIG. 5B is a cross-sectional view taken along the line X′-X ′ of FIG. 5A, and FIG. 5C is an enlarged view of a portion K of FIG.

  A groove 25 'is formed in the raised portion 23' of the valve receiving member 20 '. The valve receiving member 20 'is similar to the valve receiving member 20 except that a groove 25' is formed.

  A plurality of grooves 25 'are formed concentrically with the flow hole 21' toward the inside (the flow hole 21 'side) including at least the top of the raised portion 23'.

  As a specific example, the cross section of the raised portion 23 ′ is formed into a semicircular shape having a radius of 0.5 mm, and is formed in a range of 80 to 90 ° toward the inside (the flow hole 21 ′ side) including the top of the raised portion 23 ′. At intervals of 0.2 mm, six grooves having a depth of 0.2 mm are formed concentrically with the flow hole 21 ′.

  As the material for forming the valve receiving member 20 ', a polyacetal (POM) resin, a polytetrafluoroethylene (PTFE) resin, and a polyphenylene sulfide (PPS) resin, which are excellent in machinability, are suitable for forming the groove 25'. ing.

  By providing the groove 25 'in the raised portion 23', the contact area of the valve molded body with the contact portion increases, so that the sealing performance between the valve molded body 10 and the valve receiving member 20 can be improved. Further, by forming a plurality of grooves 25 ′ concentrically with the flow hole 21 ′, the sealing performance between the valve molded body 10 and the valve receiving member 20 can be more reliably improved.

  Therefore, the provision of the stopper 22 ′ can maintain the sealing surface at a constant pressure, but does not lower the sealing performance even when the maximum suction pressure decreases.

  As described above, the embodiments of the present invention have been described with reference to specific examples. Needless to say, the present invention is not limited to the above-described embodiments, and the shapes, dimensions, materials, and the like of the components are within the scope of the present invention. Can be changed as appropriate.

1, 1A, 1B: valve,
10: valve molded body, 11: closed part, 12: opening part, 13: outer peripheral contact part,
Reference numeral 20: valve receiving member, 21: communication hole, 22: stopper, 23: raised portion, 24: peripheral portion,
20 ': Valve receiving member, 21': Flow hole portion, 22 ': Stop portion, 23': Raised portion, 24 ': Peripheral portion,
25 ': groove 100: pump head, 101: valve case, 102: diaphragm,
103: chamber, 103a: suction hole, 103b: discharge hole,
104: Pushing member,
105a: suction path, 105b: discharge path,
106: O-ring, 107: intermediate storage,
130: suction side nozzle, 130a: suction port,
140: discharge side nozzle, 140a: discharge port,
200: Head

Claims (3)

A valve structure of a diaphragm pump including a pair of valves that opens a suction port and closes a discharge port during a suction operation of a diaphragm and closes a suction port and opens a discharge port during a discharge operation of the diaphragm,
At least a valve on the suction port side of the pair of valves,
A valve receiving member having a flow hole portion and a valve molded body having a closing portion closing the flow hole portion,
A raised portion is provided on the periphery of the flow hole portion,
The cross section of the ridge is semicircular, and the ridge is formed with a groove,
A valve structure for a diaphragm pump, wherein a stop portion for suppressing suction of the closing portion is provided inside the flow hole portion.   The valve structure for a diaphragm pump according to claim 1, wherein the stopper is provided in a wall shape that partitions the opening of the flow hole into a plurality. The valve structure of a diaphragm pump according to claim 1 , wherein the flow hole is circular, and the groove is formed concentrically with the flow hole .

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